With the depletion of high-quality iron ore resources, high-phosphorus oolitic hematite (HPOH) has attracted great attention due to its large reserve and relatively high iron content. However, HPOH is very difficult to be used in ironmaking process due to its special structure. A two-step method of gas-based direct reduction and magnetic separation was thus …
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The increasing demand for iron ore in the world causes the continuous exhaustion of magnetite resources. The utilization of high-phosphorus iron ore becomes the focus.
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Magnetite was greatly effective for phosphorus removal in the column experiments, which is a more practical reflection of phosphorous removal combing the adsorption isotherm model and …
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The high phosphorus content in the main zone is interpreted to result in crystallization of ilmenite and ilmenomagnetite instead of Ti-rich magnetite under relatively high f O2 conditions. High concentrations of titanium, iron and phosphorus in rocks of the main zone can be explained by pre-emplacement crystal-melt fractionation in a deep magma ...
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Processes 2020, 8, 874 2 of 16 According to the statistical data of the international fertilizer organization, it was concluded that the decline in the global raw ore quality leads to the continuous decline in the proportion of the world0s P2O5 grade to more than 32% of the high-quality commodity phosphate ore. P2O5 grade has been an important supply source of …
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Using the process of suspension magnetization roasting followed by magnetic separation and flotation to treat high-phosphorus iron ore, Zhang et al. [26] found that the Fe grade increased from 42.93 % to 59.50 % and the P content decreased from 0.58 % to 0.32 %, and near half of the phosphorus remained in the residual apatite after iron selection.
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The genesis of high-grade Fe-Ti-V oxide ores (up to >90 vol%) in layered intrusions remains highly debated. Here, on example of Hongge layered intrusion in China, we show that hydrothermal dissolution and precipitation of Fe-Ti-V oxides played a critical role in forming high-grade massive ore deposits as demonstrated by textural-compositional evidence and in-situ …
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Phosphorus-bearing refractory iron ore is a typical refractory iron resource with low Fe content, weakly magnetic, and high phosphorus content [8], [9].When traditional beneficiation methods, such as gravity separation, magnetic separation, and flotation, are employed to extract iron from gangue, the Fe recovery and Fe grade of concentrate are very low [10], [11], [12].
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Magnetite (Fe 3 O 4) ... [32], or metal carbonate [17], or layered double hydroxide [36], demonstrate both simplicity and high performance in phosphate removal. Zinc (Zn)-based Fe 3 O 4 composites have attracted growing attention due to the low solubility product (K sp-298 K) of Zn 3 (PO 4) 2, which is 10 −32.04.
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Phosphorus (P) is an essential nutrient for biological growth on Earth, widely used in agriculture [19].Since it cannot be substituted in food production, its availability is crucial for enhancing soil productivity, supporting crop yields, and sustaining the global human population [8].With the global population projected to increase by 2050, food demand is expected to rise by …
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This work prepared lanthanum hydroxide (La-OH) and magnetite/lanthanum hydroxide composite (Mag-La-OH), and then La-OH and Mag-La-OH were used as sediment amendments to immobilize phosphorus (P) in sediments. The immobilization efficiency of mobile P (Mob P) and bioavailable P (BIO-P) in sediments by La-OH and Mag-La-OH was …
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Enhanced Biological Phosphorus Removal (EBPR), in which the reactor processes are optimized for high-efficiency phosphorus removal, can increase the biomass content of waste sludge to 3–6% phosphorus compared to conventional activated sludge systems (normally 1.5–2%). ... For biological processes, magnetite-based ballasted clarification can ...
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Acid leaching is an effective method for dephosphorization; however, it is time-consuming and requires a high amount of acid consumption, resulting in increased production costs and environmental risks. This work aims to remove silicon, aluminum, and phosphorus …
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2.1.1. Medium Phosphorous Magnetite Ore The medium phosphorus magnetite ore (hereafter referred as raw ore) used in this work was provided by the Bayan Obo iron ore in Baotou, China. The main chemical com-position is listed in Table 1. The total iron grade is as low as 31.70 mass% and phosphorus content is as high as 0.91 mass%.
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To reclaim phosphorus from wastewater efficiently and conveniently, a novel magnetic adsorbent with aminated lignin/CeO 2 /Fe 3 O 4 composites (AL-NH 2 @Fe 3 O 4-Ce) possessing a high affinity to phosphate and easily separated from aqueous solutions was developed in this work. The characterization results revealed that Fe and Ce elements have ...
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The release of phosphorus from sediment and the high concentration of phosphorus in the water environment make the water body continuously eutrophic, so it is very important to develop new ...
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Medium and high phosphorus iron ores account for a high proportion of the total iron ore reserves in China, typical deposits are Bayan Obo medium phosphorus magnetite and western Hubei oolitic high phosphorus hematite. It is of great significance to study how to remove the harmful element phosphorus from iron ores and realize the utilization of ...
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In this paper, an innovative method is proposed to upgrade iron and remove phosphorus from high-phosphorus oolitic hematite ore by the sodium magnetization roasting–magnetic separation–sulfuric acid and sodium hydroxide leaching process. The process parameters of sodium magnetization roasting, acid leaching, and alkaline leaching were …
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In contrast, other magnetite phosphate adsorbents, such as MgO-impregnated magnetic biochar (Li et al., 2016), MgO-coated magnetic Fe 3 O 4 @SiO 2 nanoparticles (Li et al., 2022), andFe 3 O 4 @SiO 2-Mg 3 Fe LDH (Lu et al., 2020), exhibit weaker interactions between magnetite and adsorptive nanoparticles. This leads to detachment of the active ...
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magnetite distribute almost all regions of China[2～5], but ... High-phosphorus iron ore mines distribute in Yunnan, Sichuan, Hubei, Hunan, Anhui, Jiangsu Provinces of
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(Received on April 2, 2019; accepted on September 6, 2019) Time-dependent phosphorus migration characteristics during the carbothermic reduction process have been investigated …
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Using confocal laser scanning microscopy (CLSM), this study first investigated the phosphorus transformation under a high-purity Ar atmosphere heating from 25 °C to 1500 °C.
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EXD analysis confirmed Fe and O as the main constituents. The particles demonstrated effectiveness in phosphorus adsorption, with Scheme 1 exhibiting superior yield, P-recovery, and regeneration. These findings offer valuable insights into magnetite particle synthesis for optimal environmental performance, particularly in phosphorus removal.
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high-phosphorus pellets,28–31) as well as the mechanism of phosphorus migration using pure reagents.32) In this work, the phosphorus migration among the gas, iron and gangue phases of medium-phosphorus magnetite ore during the carbothermic reduction process was quantitatively inves-tigated. This includes gasificating dephosphorization and
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Phosphorus concentration in the samples was analyzed using a Dionex ICS 5000 + (Thermo Scientific, US). The experimental procedure was repeated at least three times to ensure reproducibility, and the adsorbed amount of phosphorous onto magnetite particles and percentage removal of phosphorus from the solution were calculated using Eqs.
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The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in China. In this paper, the mechanism of high-temperature pretreatment for enhancing the effect of iron enrichment and dephosphorization in the magnetization roasting-leaching process was studied by X-ray …
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Phosphate Control. Calcium phosphate is virtually insoluble in boiler water. Even small levels of phosphate can be maintained to ensure the precipitation of calcium phosphate in the bulk boiler water-away from heating surfaces. ... (FeO) …
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In the first stage, a mineral slurry of 5% by weight prepared by adding 50 grams of the mineral rock phosphate to 1 litre of water and 100 mg of magnetite (fine powder) as a coating material for iron and the BENEF1CIATION OF PHOSPHATE ORES USING HIGH GRADIENT MAGNETIC SEPARATION 153 Phosphaleore (RSMDC) (Phosphorite 9 Calcite and Silica ...
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Using magnetite-based nanocomposite adsorbents to remove and recycle phosphate from wastewater is crucial for controlling eutrophication and ensuring the sustainable use of phosphorus resources. However, the weak structural stability between magnetite and adsorptive nanoparticles often reduces phosphate removal efficiency in real-world ...
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The material used for removing phosphorus must satisfy the following preconditions as an adsorbent: (1) high adsorption rate, (2) ... This result indicates that the proper ratio of phosphorous to magnetite is an important factor in the performance of an effective phosphorous removal process.
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effluent targets down to 0.05 mg/L total phosphorus, deal with wide fluctuations in flow, influent phosphorus and total suspended solids all within a compact footprint. This paper explains how magnetite ballasted technology came to be selected and presents almost eight years of operational experience and performance data. INTRODUCTION
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Phosphorus associated with the goethite in high-phosphorus iron ores can be removed to 0.075% P using a heat treatment at 300–350°C for 1 h with 10 wt% NaOH, followed by a water leach.
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Calcium carbonate, renowned for its affordability and potent dephosphorization capabilities, finds widespread use as a dephosphorization agent in the direct reduction roasting of high-phosphorus oolitic hematite (HPOIO). However, its precise impact on iron recovery and the dephosphorization of iron minerals with phosphorus within HPOIO, particularly the mineral …
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Reduction characteristics of high phosphorus . ... Magnetite converted from hematite was enriched in the concentrate of magnetic separation, while manganosite transformed from pyrolusite and ...
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Study results showed that magnetite has a great potential for phosphorus removal because of its high efficiency, especially at low concentrations of input phosphorus. It was also found that the...
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Phosphorus (P) is a non-renewable nutrient element for crop growth and a critical element for all living organisms. [1,2] It is used in fertilizers and feed extracted from phosphate rock, a rapidly depleted resource.[3,4] In recent years, with the global supply of high-quality phosphate rock reserves decreasing sharply, it is critical to find other phosphorus sources and …
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The high affinity of Mg for phosphate and the formation of magnesium phosphate contribute to the effective regeneration of magnetite adsorbents and high-performance …
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High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93% phosphorus (present as …
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The result indicated that low ion strength (<0.05 M) had limited role in phosphate adsorption while high levels (>0.1 M) decreased the adsorption of phosphate in the presence of CA. This was because of the ability of ions to compete for binding sites of magnetite with phosphate ion. 3.4. Generation and recycle
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Du et al. (2019) used magnetite as magnetic seeds, and 7.5 g/L magnetite was required to enhance the sedimentation effect of coagulation flocs for wastewater with the phosphorous concentration of 134 mg/L. Comparatively, only 2.0 g/L of MS-CFA was required for wastewater with 200 mg P/L, saving almost half of the dosage. This indicated that MS ...
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